Question

我正在做一些像twitters仪表板系统来改善我的Java Faces knowladge。我有一个名为dashborad的问题。我需要在索引中发布帖子来显示登录用户后面的人。像Facebook的墙壁或Twitters仪表板。我做了一些事情。但是我有一个错误。它是一个NullerPointerException.Here是我的代码：这是我的模型代码。它是数据库的追随者。

public void whoIFollow(int[] list) throws SQLException {
  MembersModel person = new MembersModel();
  person.LoggedUserInfo(person.getSession());
  long userid = person.getId();
  Statement stat = (Statement) getConnect().createStatement();
  ResultSet result = stat.executeQuery("SELECT * FROM `following` WHERE `follower_id`="+ userid); // Sorting following table which equals Logged Users id
  int i = 0;
  while (result.next()) {
    list[i] = result.getInt("user_id");
    i++;
  }
  if (i == 0) {
    System.err.println("i sıfıra eşit");
  }
}

这是Dashboard类中的getPosts方法：

public List<BlogPost> getPosts() throws SQLException {
        FollowingModel test = new FollowingModel();
        FollowingBlog post = new FollowingBlog();
        try {
            test.whoIFollow(followingList);
            String following = null;


            for (int i = 0; i < followingList.length; i++) {
                if (i == followingList.length) {
                    following += followingList[i];
                } else {
                    following += followingList[i] + ",";
                }
            }
            post.listPost(posts, following);
        } catch (NullPointerException e) {
            System.err.println("Hataa");
        }
        return posts;
    }

* 我在DashBoard类*
此外，在DashboardClass中发布ArrayList 我的错是什么？

感谢您的帮助 最佳退伍军人

仪表板系统中的空指针异常

0 个答案: